Patent Number: 7,088,111

Title: Enhanced isolation level between sampling channels in a vector network analyzer

Abstract: A system and method for providing improved isolation between sampling channels in a vector network analyzer and sampling circuit. A vector network analyzer sampling channel includes a non-linear transmission line, an isolation device, a band-pass filter, and a sampler. The nonlinear transmission line receives a continuous-wave driving signal and generates a shockwave from which a pulse signal is generated. The pulse signal is used to gate the sampler and thus sample an RF signal. The isolation device and band-pass filter provide reverse isolation for RF signals traveling in the reverse direction within the channel and prevent RF signal leakage between vector network analyzer channels. The isolation device may include an isolator, amplifier or other reverse isolation device, and is used in conjunction with a band-pass filter. The band-pass filter is used to pass a frequency band for driving the non-linear transmission line. The stop-bands of the band-pass filter are used to prevent the RF leakage signal from reaching other sampling channels.

Inventors: Noujeim; Karam Michael (Sunnyvale, CA)

Assignee: Anritsu Company

International Classification: G01R 27/28 (20060101); G01R 13/14 (20060101); G01R 27/04 (20060101)

Expiration Date: 8/08/02018